general structure of http requests
--

Client					Server
	 --> client Request
		Method URI HTTP-version	#cmd file protocol
		General-header
		Request-header
		Entity-header
		Entity-body

	 <-- Server Response	
		HTTP-version Status-code Reason-phrase
		General-header
		Response-header
		Entity-header
		Entity-body


Client Request
 Method URI HTTP-version	POST /cgi-bin/query HTTP/1.0
 General-header			Connection: Keep-Alive
 Request-header			Refer http://hypotherical.ora.com/search.html
				User-Agent Mozilla/3.0Gold (WinNT:1)
				Host: hypothetical.org.com
				Accept:image/gif, image/x-xbitmap, image/jpeg
				image/pjpeg,*/*
 Entity-header			Content-type: application/x-www-from-urlencoded Content-length 23
 Entity-body			query=knuth&type=author

Server Response	
 HTTP-version Status-code Reas	HTTP/1.0 200 OK
 General-header			Date: Fri, 04
 Response-header		Server: Apache/1.1.1
 Entity-header			Content-type:text/html
				Content-length:327
				Last-modified: Fri,04 Oct
 Entity-body			<title>Sample Homepage</title>
				<img src='/image/orilly_mast.gif'>

HTTP transactions do not need to use all the headers. In fact, it is possible to perform 
some HTTP requests without supplying any header information at all. 
A request of GET / HTTP/1.0 with an empty header is sufficient for most servers to understand the client.